WorldGenNettlePatch.java

package erebus.world.feature.plant;

import erebus.ModBlocks;
import net.minecraft.init.Blocks;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import net.minecraft.world.gen.feature.WorldGenerator;

import java.util.Random;

public class WorldGenNettlePatch extends WorldGenerator {
	@Override
	public boolean generate(World world, Random rand, int x, int y, int z) {
		float ang, len;

		for (int attempt = 0, placed = 0, xx, yy, zz; attempt < 48 && placed < 15; ++attempt) {
			ang = (float) (rand.nextDouble() * Math.PI * 2D);
			len = rand.nextFloat() * (0.3F + rand.nextFloat() * 0.7F) * 7F;

			xx = (int) (x + 0.5F + MathHelper.cos(ang) * len);
			yy = y + rand.nextInt(3) - rand.nextInt(3);
			zz = (int) (z + 0.5F + MathHelper.sin(ang) * len);

			if (world.isAirBlock(xx, yy, zz) && world.getBlock(xx, yy - 1, zz) == Blocks.grass) {
				world.setBlock(xx, yy, zz, rand.nextBoolean() ? ModBlocks.nettle : ModBlocks.nettleFlowered, 0, 2);
				++placed;
			}
		}

		return true;
	}
}